Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 73 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
3. 3.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle
4. 4.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a magnet
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is the one thing we change? (a) the kind of coins (b) where the pencil is (c) the number of coins (d) distance from the pencil
9. 9.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a sloping road (c) a bottle opener (d) a spoon lifting a lid
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the number of coins (c) which side goes down
11. 11.True or false: a well pulley is a lever. (a) False (b) True
12. 12.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) neither, it balances (c) the left side (d) both go up
13. 13.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
14. 14.True or false: a crane is a wheel and axle. (a) True (b) False
15. 15.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
16. 16.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
17. 17.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
18. 18.⚙️ Which of these is a lever? (a) a steering wheel (b) a crane (c) a ramp (d) a crowbar
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we keep it the same (b) we change it (c) we measure it
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
21. 21.True or false: a flat table is needed for the ruler lever. (a) True (b) False
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) coins of one kind (d) yeast
24. 24.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
25. 25.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
26. 26.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we keep it the same (b) we change it (c) we measure it
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a round pencil (d) a flat table
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we keep it the same (b) we measure it (c) we change it
30. 30.True or false: a slide is a lever. (a) True (b) False
31. 31.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a steering wheel (c) a sloping road (d) a flagpole
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we measure it (b) we change it (c) we keep it the same
33. 33.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
34. 34.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a battery cell (d) a mirror
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
36. 36.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
37. 37.True or false: a doorknob uses a pulley. (a) True (b) False
38. 38.⚙️ Which simple machine is a tap handle? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
39. 39.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
40. 40.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a flat table (d) a balloon

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